Op amp chip: 4 NE5532 Frequency division structure: Linkwitz-Rayleigh filter Signal input: two-channel 2.0 stereo input Frequency division slope: 12dB/Oct 12dB (2nd oroder) Audio output: 6-channel output (treble left and right channels, midrange left and right channels, bass left and right channels) Capacitor type: Correction capacitor Resistor type: high-precision metal film resistor Filtering structure: high-pass filtering, low-pass filtering, band-pass filtering Power supply: dual power transformer 9-12V, be careful not to exceed 12V25W (use preamplifier A small transformer like used for the module is sufficient, do not use a large transformer) Module size: 99mm x 96mm x 19mm (length, width and height) Default crossover: (treble 3288Hz midrange 328Hz bass) Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Material: PCB colour: Black Package Contents: 3 x Speaker Crossover Filter Divider Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.